scholarly journals Securing Communication via Transmission of Artificial Noise by Both Sides: Bipolar-Beamforming Optimization

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Yongkai Zhou ◽  
Yan Zhu ◽  
Fangbiao Li ◽  
Zachary Imm ◽  
Xinxing Yin ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Artificial Noise ◽  
Secrecy Capacity ◽  
Extreme Conditions ◽  
Power Ratio ◽  
Channel Condition ◽  
Wireless Environment ◽  
Transmitting Antenna ◽  
Secure Transmission ◽  
Signal Maximum

The paper considers the secure transmission in a wireless environment in which both the transmitter (Alice) and the legitimate receiver (Bob) send artificial noise (AN) to interfere with the eavesdropper (Eve). Optimal design is analyzed in detail for this AN-by-both-side model to deal with Eve’s stochastic channel condition and random spatial distribution. Bipolar-beamforming is first proposed to jointly design Alice and Bob’s transmitting signals. By optimally assigning the transmitting antenna for Bob and allocating the power ratio between Alice’s information and the AN signal, maximum secrecy capacity can be achieved. Simulation is done to illustrate the process of bipolar-beamforming optimization. Results show that the AN-by-both-side model has good secrecy performance on both average and extreme conditions as Eve approaches Alice or Bob.

scholarly journals SCO-AN:Improve Secrecy Capacity for Secure Transmission Using Power Allocation

2020 ◽  
Author(s):  
Yebo Gu ◽  
Zhilu Wu ◽  
Zhendong Yin ◽  
Bowen Huang
Keyword(s):  
Convex Optimization ◽  
Power Allocation ◽  
Channel Capacity ◽  
Physical Layer Security ◽  
Small Extent ◽  
Quadratic Program ◽  
Artificial Noise ◽  
Secrecy Capacity ◽  
Power Limit ◽  
Secure Transmission

Abstract Artificial noise(AN) is a core technique in physical layer security field which has been widely studied.AN reduces the channel capacity of eavesdroppers without affecting the channel capacity of the communicator so that AN can increase secrecy capacity.Secrecy capacity is defined as channel capacity of the communicator minus channel capacity of eavesdroppers.The AN is prohibited from affecting the channel capacity of the legal receiving channel. This condition brings good performance to AN as well as limitations.Recently, the secrecy capacity optimization artificial noise (SCO-AN) is proposed to increase the secrecy capacity more effectively.SCO-AN can reduce the channel capacity of the communicator to a small extent while greatly reducing the channel capacity of the eavesdropper. So, SCO-AN can further expand the secrecy capacity on the basis of AN. Due to the limitation of transmit power, SCO-AN cannot be added indefinitely, so it is an important issue to increase the secrecy capacity as much as possible under a certain power limit.In this paper, a secrecy capacity function with SCO-AN added under certain power constraints is established.Because this function is non-convex, the traditional convex optimization algorithm cannot be applied. A sequence quadratic program(SQP) is adopted to solve this power allocation problem.Simulation results show that SQP can effectively improve the secrecy capacity under a certain power limit.

scholarly journals A Novel Pilot Spoofing Scheme via Intelligent Reflecting Surface Based On Statistical CSI

2020 ◽  
Author(s):  
jie yang ◽  
Xinsheng Ji ◽  
Kaizhi Huang ◽  
Xiaoli Sun ◽  
Xiaoming Xu
Keyword(s):  
Original Problem ◽  
Optimal Solution ◽  
Phase Shifts ◽  
Communication Process ◽  
Secrecy Rate ◽  
Channel State ◽  
Wireless Environment ◽  
Time Division ◽  
Reflecting Surface ◽  
Secure Transmission

Pilot spoofing attack brings challenges to the physical layer secure transmission. However, since the inherent characteristics of wireless environment have not changed, active eavesdropping can be detected based on prior information. Intelligent reflecting surface (IRS), with the real-time programmable characteristics for wireless environment, provides new possibilities for effective pilot spoofing. In this paper, the IRS is deployed near the legitimate users and the control strategy is embeded into the legitimate communication process under time-division duplex (TDD) mode to assist eavesdroppers to implement pilot spoofing. By designing different phase shifts at the IRS during the uplink phase and downlink phase, the channel reciprocity between uplink and downlink disappears, and thus the secure beamforming vector is biased towards the eavesdropper. Furthermore, in order to obtain more information, the average secrecy rate based on the statistical channel state information is established by carefully designing the phase shifts. The formulated problem is non-trivial to solve. By using alternating optimization and Charnes-Cooper transformation technique, the original problem is transformed into convex form and a sub-optimal solution is achieved. Finally, simulation results show that our proposed scheme poses serious secure threat for TDD systems.

scholarly journals Broadcasting Directional Modulation Based on Random Frequency Diverse Array

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Jian Xie ◽  
Bin Qiu ◽  
Qiuping Wang ◽  
Jiaqing Qu
Keyword(s):  
Physical Layer Security ◽  
Artificial Noise ◽  
Power Requirement ◽  
Second Stage ◽  
Broadcasting System ◽  
Random Frequency ◽  
Frequency Diverse Array ◽  
To Receive ◽  
Secure Transmission ◽  
Directional Modulation

Frequency diverse array- (FDA-) based directional modulation (DM) is a promising technique for physical layer security, due to its angle-range dependent transmit beampattern. However, the existing schemes are not suitable for the broadcasting scenario, where there are multiple legitimate users (LUs) to receive the confidential message. In this paper, we propose a novel random frequency diverse array- (RFDA-) based DM scheme to realize the point to multi-point broadcasting secure transmission in both angle and range dimension. In the first stage, the beamforming vector is designed to maximize the artificial noise (AN) power, while satisfying the power requirement of LUs for transmitting the confidential message simultaneously. In the second stage, the AN projection matrix is obtained by maximizing signal-to-interference-plus-noise ratio (SINR) at the LUs. The proposed scheme only broadcasts the confidential message to the locations of LUs while the other regions are covered by AN, which promotes the security of the wireless broadcasting system. Moreover, it is energy efficient since the power of each LU is under accurate control. Numerical simulations are presented to validate the performance of the proposed scheme.

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